Here's another photo that's doing the rounds on the internet. It's captioned 'Tank Silencer'. I have no idea what this device is actually used for, but somehow I don't think it's a tank silencer. So this would be a case of 'real picture, false caption.' Click image for larger version. (via Hell in a Handbasket
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Now we need an SUV silencer.
Why is it there? so it can be fired for testing on a range without upsetting locals too much.
Why is it camouflaged? To make it less obvious from the air and also because that is the kind of paint we tend to have a lot of.
Self-propelled artillery vehicle... or tank. Ya know... it's an armoured vehicle on tracks. It shoots a big gun and has guys inside. It looks like a tank. It's built like a tank. Therefore, it's a friggin' tank. With a big gun!
Given that I have provided the answer and you now know, I am a little confused as to why you are banging on about it.